PSY280H1 Chapter : Ch14 Textbook Notes
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PSY280H1 Full Course Notes
Verified Note
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Document Summary
Prevents bodily fluids from escaping, protects us from bacteria, chemicals, and dirt, provides us with information about the stimulus that contact it. Epidermis, the outer layer of dead skin cells. Dermis: mechanoreceptors, receptors that respond to mechanical stimulation. Merkel receptor: located close to the surface of the skin, fires to continuous pressure (fine details) Meissner corpuscle: located close to the surface of the skin, fires to on and off (handgrip control) Ruffini cylinder: located deeper in the skin, fires to continuous pressure (stretching) Pacinian corpuscle: located deeper in the skin, fires to on and off (vibration, fine texture by moving fingers) Nerve fibres from receptors in the skin travel in bundles (peripheral nerves) that enter the spinal cord through the dorsal root; two major pathways: medial lemniscal pathway. has large fibres that carry signals related to sensing the positions of the limbs and perceiving touch: spinothalamic pathway.
